21431422988 has 12 divisors (see below), whose sum is σ = 38033230032. Its totient is φ = 10564785840.

The previous prime is 21431422979. The next prime is 21431423009. The reversal of 21431422988 is 88922413412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37731095 + ... + 37731662.

It is an arithmetic number, because the mean of its divisors is an integer number (3169435836).

Almost surely, 2^21431422988 is an apocalyptic number.

It is an amenable number.

21431422988 is a deficient number, since it is larger than the sum of its proper divisors (16601807044).

21431422988 is a wasteful number, since it uses less digits than its factorization.

21431422988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75462832 (or 75462830 counting only the distinct ones).

The product of its digits is 221184, while the sum is 44.

The spelling of 21431422988 in words is "twenty-one billion, four hundred thirty-one million, four hundred twenty-two thousand, nine hundred eighty-eight".